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University of California Publications in Geology [Vol. 8 



are nodose. The type specimen is so eroded that it is impossible to 

 describe its spire decoration in detail. The body-whorl is decorated 

 by eight strong spiral lines above a very distinct sulcus, which is 

 situated two-thirds of the distance of the body-whorl length below the 

 suture. About seven smaller spiral lines decorate the area below the 

 sulcus. Both sets of spiral lines are crossed by vertical growth lines. 

 There are beads formed at the crossing of the spiral and vertical lines. 

 Outer lip, simple ; inner lip, slightly incrusted by a thin callus. 

 Umbilicus, subimperf orate. 



Molopophorus(f) howardi, n. sp. appears to be close to Turbinella 

 crassitesta Gabb in general form, but its decoration is slightly different 

 and the presence of a well-marked sulcus upon it serves to distinguish 

 it from T. crassitesta. 



Named in honor of Delle Howard Dickerson, who has greatly 

 assisted the writer in this and other investigations on the Eocene of 

 California. 



Dimensions. — Length, 30 mm.; width of body-whorl, 18 mm. 



Occurrence. — University of California Locality 2245, Rock Creek 

 Quadrangle, Los Angeles County, California, on Pinyon Ridge, one 

 mile southwest of U. S. Geological Survey bench mark (3972 ft.) at 

 Shoemaker. 



NATICA PINYONENSIS, n. sp. 

 Plate 29, figures 5a and 56 



Shell of moderate size, globose, with four or five tabulate whorls. 

 The spire is about one-fifth of the total height. The upper third of 

 each whorl is distinctly tabulated while the rest of the whorl is con- 

 vex. Suture linear. Body-whorl, convex. Mouth, semilunar ; outer 

 lip, simple; inner lip, incrusted; umbilicus, open, long and narrow. 



Named for its occurrence on Pinyon Ridge. 



Dimensions. — Height, 27 mm. ; width of body- whorl, 28 mm. 



Occurrence. — This species was found at University of California 

 Locality 2245, Martinez of Rock Creek, Los Angeles County, Cali- 

 fornia. It is readily distinguished from Gyrodes lineata Dickerson by 

 the more pronounced tabulation of its whorls and by its lack of spiral 

 threads. 



Transmitted September 17, 1914. 



